package org.lop.modules.utils;

import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * 异常工具.
 * 
 * @author 潘瑞峥
 * @date 2013-6-3
 */
public class ExceptionUtils {

	/**
	 * 将CheckedException转换为UncheckedException.
	 */
	public static RuntimeException unchecked( Exception e ) {
		if ( e instanceof RuntimeException ) {
			return ( RuntimeException ) e;
		} else {
			return new RuntimeException( e );
		}
	}

	/**
	 * 将ErrorStack转化为String.
	 */
	public static String getStackTraceAsString( Exception e ) {
		StringWriter stringWriter = new StringWriter();
		e.printStackTrace( new PrintWriter( stringWriter ) );
		return stringWriter.toString();
	}

	/**
	 * 判断异常是否由某些底层的异常引起.
	 */
	public static boolean isCausedBy( Exception ex, Class<? extends Exception>... causeExceptionClasses ) {
		Throwable cause = ex.getCause();
		while ( cause != null ) {
			for ( Class<? extends Exception> causeClass : causeExceptionClasses ) {
				if ( causeClass.isInstance( cause ) ) {
					return true;
				}
			}
			cause = cause.getCause();
		}
		return false;
	}

}